What are the world's worst airports for 2015?

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Photos:The world's worst and best airports of 2015

Worst: 10. Beauvais-Tille International Airport (Paris) – "If the 7th Circle of Hell were a place on earth, it would be 'Paris' Beauvais-Tille," said one traveler who responded to the Guide to Sleeping in Airports' 2015 best/worst airport survey. Why all the hate? According to the travel site, grievances generally revolve around the absence of chairs, kind staff, sufficient toilets and hygienic standards.

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Photos:The world's worst and best airports of 2015

Worst: 9. Benazir Bhutto International Airport (Islamabad, Pakistan) – Ranked the world's "Worst Airport of 2014," Islamabad's international airport has seen improvements over the past year, said Sleeping in Airports. Washrooms have been upgraded, while a new lounge has been added. The airport also increased the number of check-in and immigration counters. Nonetheless, critics say it could still use a good scrub, better crowd control and friendlier staff.

Worst: 7. Hamid Karzai International Airport (Kabul, Afghanistan) – "Given the current political state of Afghanistan relative to other nations on this global list, we're reluctant to criticize Kabul's international airport too harshly," said Sleeping in Airports, noting that the international terminal has undergone a number of renovations over the last decade, making it a little more friendly to travelers. Voters complained about overall cleanliness, a lack of comfort and the accountability of staff.

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Photos:The world's worst and best airports of 2015

Worst: 6. Toussaint Louverture International Airport (Port au Prince, Haiti) – Sweltering heat, a lack of chairs and untrustworthy staff were the biggest complaints among travelers who gave Haiti's international gateway the thumbs down. "The good news is that renovations are said to be currently underway, giving a little bit of hope to the future of PAP," said Sleeping in Airports.

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Photos:The world's worst and best airports of 2015

Worst: 5. Simón Bolívar International Airport (Caracas, Venezuela) – According to voters who responded to this year's Sleeping in Airports survey, Caracas International Airport is chaotic, uncomfortable and dull. "An absence of chairs and dirty bathrooms worsen the experience here -- to say nothing of the low quality of food." said the website.

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Photos:The world's worst and best airports of 2015

Worst: 4. Tashkent International Airport (Uzbekistan) – In spite of a few recent upgrades to the departures area, the queues and crowds at Tashkent International Airport continue to be a frustrating experience. "Worsening the situation is that these queues are often chaotic-verging-on-aggressive, and lack any form of crowd control," said Sleeping in Airports.

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Photos:The world's worst and best airports of 2015

Worst: 3. Tribhuvan International Airport (Kathmandu, Nepal) – Though Nepal's only international airport gathered ample criticism over the past year, Sleeping in Airports stressed the country has been under considerable pressure following April's devastating earthquake that damaged its sole runway. "Given this, voters had understandably poor experiences at the airport, particularly within the domestic terminal," said the website. "The good news is that KTM is currently re-building the much-loathed domestic terminal."

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Photos:The world's worst and best airports of 2015

Worst: 2. Jeddah King Abdulaziz International Airport (Saudi Arabia) – "From smoking in non-smoking areas to the bathroom odor wafting out into the lounges, few people sang praises after spending time here," said Sleeping in Airports. A number of voters suggested booking layovers elsewhere -- at all costs. There is some positive news -- the new Jeddah Airport is scheduled to open mid-2016.

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Photos:The world's worst and best airports of 2015

Worst: 1. Port Harcourt International Airport (Nigeria) – Unpleasant and unhelpful staff, a lack of seating, broken air-conditioning and the fact the arrivals hall was inside a tent were among complaints listed by Sleeping in Airports about Port Harcourt International.

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Photos:The world's worst and best airports of 2015

Best: 10. Kloten International Airport (Zurich, Switzerland) – Zurich's International airport is precise, efficient and tidy, said Sleeping in Airports. The low lighting and impeccably clean surroundings make it a calm and soothing place to navigate.

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Photos:The world's worst and best airports of 2015

Best: 9. Kuala Lumpur International Airport – Kuala Lumpur's main terminal received high marks for being clean, spacious, comfortable and organized. There are plenty of restaurant and shopping options as well as free Wi-Fi. "That said, the airport's KLIA2 Terminal drops the airport's overall score by a number of points," said Sleeping in Airports. "Noisy, cold and uncomfortable, this terminal is a far less impressive counterpart to the main terminal."

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Photos:The world's worst and best airports of 2015

Best: 8. Vancouver International Airport (Canada) – "Ultra-welcoming, thoughtfully designed, extremely comfortable and fantastically friendly, YVR topped our North American charts for another year running," said Sleeping in Airports. Highlights at Vancouver International Airport include the giant aquarium in the international departures lounge, dozens of art and museum exhibits, self-guided tours and a decent variety of shops and restaurants.

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Photos:The world's worst and best airports of 2015

Best: 7. Helsinki International Airport (Finland) – Though innovative and transit-friendly Helsinki International Airport continued to impress travelers, this year it was their introduction of sleep pods in March that really generated the most positive feedback, said Sleeping in Airports.

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Photos:The world's worst and best airports of 2015

Best: 6. Munich International Airport (Germany) – Efficient, speedy and impressively organized, layovers through Munich International are delightfully straightforward and reliable, said Sleeping in Airports. These precise terminals are not without their comfort and frills either. The airport has its own brewery, spa, casino, cinema and mini-golf course.

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Photos:The world's worst and best airports of 2015

Best: 5. Hong Kong International Airport – Hong Kong International Airport was praised by Sleeping in Airports voters for its diverse list of amenities, including gardens, sleep rooms, spas and showers within a naturally light and airy space.

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Photos:The world's worst and best airports of 2015

Best: 4. Taipei Taoyuan International Airport (Taiwan) – Themed chairs, a red carpet and a free travel library keep passengers entertained as they explore each gate, eventually finding their own, said Sleeping in Airports. Other perks include free 15-minute showers and a number of art and museum exhibits.

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Photos:The world's worst and best airports of 2015

Best: 3. Haneda International Airport (Tokyo, Japan) – Tokyo Haneda is admired by travelers for being tidy, efficient, modern and generally just really pleasant, said Sleeping in Airports. Connected to the city center in roughly 45 minutes by public transport, it's far preferred to Tokyo's other airport, Narita, which is about two-hours away.

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Photos:The world's worst and best airports of 2015

Best: 2. Incheon International Airport (Seoul, South Korea) – Perpetually hot on Singapore Changi's heels is Seoul Incheon -- a consistent second place winner on our best airports list, said Sleeping in Airports. "The airport earns adoration from travelers by offering up free showers, ultra-fast free Wi-Fi, plenty of comfortable seating and impeccable service.

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Photos:The world's worst and best airports of 2015

Best: 1. Changi International Airport (Singapore) – No surprises here. Once again, Singapore's international airport has topped Sleeping in Airports world's best list. Hard to top an aviation terminal that comes with a fish spa, a sauna, a butterfly garden, showers, a koi pond, a multi-story slide, a gym and a free movie theater. "Voters are quick to liken time spent here to a five-star hotel that they are sad to leave, even after 22 hours inside it," said the site.

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(CNN)Traveling through Nigeria's Port Harcourt International Airport any time soon?

Consistently bad: Saudi Arabia's King Abdulaziz International Airport

There were quite a few repeat offenders on this year's list though, as well as some notable omissions.

Filipinos will be pleased to hear their long maligned Ninoy Aquino International Airport Manila Airport, crowned worst airport three years in a row before slipping to fourth place last year, didn't even make this year's top 10.

Saudi Arabia's Jeddah King Abdulaziz International Airport held onto its position as world's second worst airport.

Voters were annoyed by the chaotic, crowded, unclean airport -- particularly within the Hajj terminal.

"From smoking in non-smoking areas to the bathroom odor wafting out into the lounges, few people sang praises after spending time here," said Sleeping in Airports.

Fortunately, the site said Jeddah's days on the list are likely numbered -- the new Jeddah Airport is scheduled to open mid-2016.

Nepal's Kathmandu Tribhuvan International Airport held onto the same spot as last year -- third.

Last year's worst airport, Benazir Bhutto International Airport in Islamabad, Pakistan, slipped to ninth place, while Tashkent International Airport in Uzbekistan rose a spot to move from fifth to fourth place.

Not a single United States airport appeared in this year's top 10, though Europe can't say the same.

France's Beauvais-Tille Airport slipped in to land the number 10 spot.

"Grievances from voters are detailed and far-reaching, but generally revolve around the absence of chairs, kind staff, sufficient toilets and hygienic standards," says Sleeping in Airports of the Paris facility.

Worst airports of 2015

1. Port Harcourt International Airport (Nigeria)

2. King Abdulaziz International Airport (Jeddah, Saudi Arabia)

3. Tribhuvan International Airport (Kathmandu, Nepal)

4. Tashkent International Airport (Uzbekistan)

5. Simon Bolivar International Airport (Caracas, Venezuela)

6. Toussaint Louverture International Airport (Port au Prince, Haiti)

7. Hamid Karzai International Airport (Kabul, Afghanistan)

8. Tan Son Nhat International Airport (Ho Chi Minh City, Vietnam)

9. Benazir Bhutto International Airport (Islamabad, Pakistan)

10. Beauvais-Tille International Airport (Paris)

Best airports of 2015

Turning to the list airports actually do want to end up on, there were few surprises on Sleeping in Airports world's best airports of 2015 roundup.

Singapore's Changi International, as it has for the last two decades, held onto the top spot.

"It's hard to know where to begin when it comes to describing the airport's strengths," said Sleeping in Airports.

"Perhaps, it's the extreme efficiency experienced when moving from the airplane to the city centre? Or maybe it's the luxurious layover indulgences, which include a fish spa, a sauna, a butterfly garden, showers and a koi pond?"

The top 10 list was dominated by Asian airports, with Seoul, Tokyo, Taipei and Hong Kong rounding out the top five.